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| Year | Blood lead level (μg/dL) | Interpretation* |
|---|---|---|
| 1960 |
60 |
NA |
| 1970 |
40 |
Undue or increased lead absorption |
| 1975 |
30 |
Undue or increased lead absorption |
| 1978 |
30 |
Elevated blood lead level |
| 1985 |
25 |
Elevated blood lead level |
| 1991 |
10 |
Level of concern |
| 2012 |
5 |
Reference value |
| 2021 | 3.5 | Reference value |
Abbreviation: NA = not available.
